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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 622 (1996), S. 1847-1853 
    ISSN: 0044-2313
    Keywords: Selenium Halides ; Crystal Structures ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Crystal Structures of SeCl3+SbCl6-, SeBr3+GaBr4-, PCl4+SeCl5-, and (PPh4+)2SeCl42- · 2 CH3CNThe crystal structures of the title compounds were determined by X-ray diffraction.SeCl3+SbCl6-: Space group P21/m, Z = 4, structure determination with 1795 observed unique reflections, R = 0.022. Lattice dimensions at -80°C: a = 940.9, b = 1066.3, c = 1234.9 pm, β = 102.79°. The compound forms ion pairs with the structure of a double octahedron with linked surfaces. SeBr3+GaBr4-: Space group Pc, Z = 2, structure determination with 1461 observed unique reflections, R = 0.058. Lattice dimensions at -60°C: a = 660.1, b = 655.3, c = 1431.3 pm, β = 101.177°. The compound crystallizes in the SCl3[AlCl4] lattice type. Between the ions there are two relatively short Se … Br—Ga contacts.PCl4+SeCl5-: Space group Ima2, Z = 8, structure determination with 1757 observed unique reflections, R = 0.029. Lattice dimensions at -50°C: a = 1651.6, b = 1201.2, c = 1166.4 pm. The SeCl5- ions are associated to chains via interionic Se—Cl … Se contacts along the crystallographic c-axis.(PPh4+)2SeCl42- · 2CH3CN: Space group P21/n, Z = 2, structure determination with 2578 observed unique reflections, R = 0.050. Lattice dimensions at -80°C: a = 1288.5, b = 726.0, c = 2585.8 pm, β = 101.65°. The compound includes planar-tetragonal SeCl42- ions, which almost meet D4h symmetry.
    Notes: Die Kristallstrukturen der Titelverbindungen wurden röntgenographisch ermittelt.SeCl3+SbCl6-: Raumgruppe P21/m, Z = 4, Strukturlösung mit 1795 beobachteten unabhängigen Reflexen, R = 0,022. Gitterkonstanten bei -80°C: a = 940,9; b = 1066,3; c = 1234,9 pm; β = 102,79°. Die Verbindung bildet Ionenpaare mit der Struktur eines flächenverknüpften Doppeloktaeders.SeBr3+GaBr4-: Raumgruppe Pc, Z = 2, Strukturlösung mit 1461 beobachteten unabhängigen Reflexen, R = 0,058, Gitterkonstanten bei -60°C: a = 660,1; b = 655,3; c = 1431,3 pm; α = 101,17°. Die Verbindung kristallisiert im SCl3[AlCl4]-Strukturtyp. Zwischen den Ionen bestehen zwei relativ kurze Se … Br—Ga-Kontakte.PCl4+SeCl5-: Raumgruppe Ima2, Z = 8, Strukturlösung mit 1757 beobachteten unabhängigen Reflexen, R = 0,029. Gitterkonstanten bei -50°C; a = 1651,6; b = 1201,2; c = 1166,4 pm. Die SeCl5- -Ionen sind über interionische Se—Cl … Se-Kontakte entlang der kristallographischen c-Achse zu Ketten assoziiert.(PPh4+)2SeCl42- · 2CH3CN: Raumgruppe P21/n, Z = 2, Strukturlösung mit 2578 beobachteten unabhängigen Reflexen, R = 0,050. Gitterkonstanten bei -80°C: a = 1288,5; b = 726,0; c = 2585,8 pm; β = 101,65°. Die Verbindung enthält planar-quadratische SeCl42--Ionen, die nahezu D4h-Symmetrie erfüllen.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 615 (1992), S. 131-136 
    ISSN: 0044-2313
    Keywords: Octaselenido niccelate complex ; synthesis ; X-ray structure ; FIR spectrum ; magnetic behaviour ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: [Na(12-Crown-4)2]2[Ni(Se4)2] · DMF; Synthesis, Crystal Structure, and Magnetic BehaviourThe title compound has been prepared from NiCl2 and sodium polyselenide in dimethylformamide solution in the presence of 12-crown-4, forming black crystal needles. They were characterized by an X-ray structure determination, by FIR spectroscopy as well as by the magnetic behaviour.[Na(12-crown-4)2]2[Ni(Se4)2] · DMF crystallizes monoclinically in the space group P21, 3650 observed unique reflections, R = 0.046. Lattice dimensions at -80°C: a = 1020.3(2); b = 1889.5(2); c = 1498.7(3) pm; β = 108.29(1)°. The compound has an ionic structure, in which the sodium atoms of the [Na(12-crown-4)2]+ cations are coordinated by the oxygen atoms of the crown ether molecules in an antiprismatic fashion. The nickel atom of the anion [Ni(Se4)2]2- is surrounded by four selenium atoms of the tetraselenide chelates in an almost planar environment. The DMF molecules are inserted in the lattice without a bonding interaction. The magnetic susceptibility observed in the temperature interval 4.2 to 330K can be interpreted by means of a 3E ground term and D2 as local symmetry, which was established by X-ray crystallography.
    Notes: Die Titelverbindung wurde aus wasserfreiem Nickel(II)-chlorid und Natriumpolyselenid in Dimethylformamid in Gegenwart von 12-Krone-4 in Form schwarzer Kristallnadeln hergestellt und durch eine röntgenographische Strukturanalyse, durch das FIR-Spektrum und durch sein magnetisches Verhalten charakterisiert.[Na(12-Krone-4)2]2[Ni(Se4)2] · DMF kristallisiert monoklin in der Raumgruppe P21, 3650 beobachtete unabhängige Reflexe, R = 4,6%. Die Gitterkonstanten sind bei -80°C: a = 1020,3(2); b = 1889,5(2); c = 1498,7(3) pm; β = 108,29(1)°. Die Verbindung hat ionischen Aufbau. In den Kationen [Na(12-Krone-4)2]+ sind die Natriumatome durch die acht Sauerstoffatome der beiden Kronenethermoleküle antiprismatisch umgeben. In dem Anion [Ni(Se4)2]2- ist das Nickelatom nur annähernd planar von den vier Selenatomen der beiden Tetraselenidchelate koordiniert. Die DMF-Moleküle sind in das Gitter ohne bindende Wechselwirkung eingelagert.Die im Temperaturbereich von 4,2 bis 330 K beobachtete Abhängigkeit der magnetischen Suszeptibilität läßt sich unter der Annahme eines 3E-Grundterms und der röntgenographisch ermittelten lokalen Symmetrie D2 am Nickelatom verstehen.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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